Shield for arc lamp reflectors



Oct. 5, 1937. p PARKER 2,094,958

SHIELD FOR ARC LAMP REFLECTORS Filed June 22, 1936 .2 Sheets-Sheet lawue/wtoo M. P. Parker.

Oct. 5, 1937. M. P. PARKER SHIELD FOR ARC LAMP REFLECTORS Filed June-22, 1936 2 Sheets-Sheet 2 W p M Patented Oct. 5, 1937 t UNITED STATESPATENT OFFICE SHIELD FOR ARC LAMP REFLECTORS Maurice I. Parker, FortDodge, Iowa Application June 22, 1936, Serial No. 86,663

6 Claims. (01. 176-115) This invention relates to an improved shield foroff until the arc reaches its maximum degree of the reflector of an arclamp which in the present intensity will be prevented from striking thepolillustration is the arc lamp of a motion picture ished surface of thereflectorand the reflector will projecting machine, and one object ofthe invennot become pitted or otherwise damaged. The

tion is to provide a reflector shield of such conshield may also beswung to the operative posistructionthat it may be mounted in thehousing tion when adjusting the carbon. of a motion picture projectingmachine and very In order to mount the shield sections for moveeasilymoved into or out of shielding relation to ment from the shieldingposition shown in Figure the reflector. It is to be understood that ashield 2 by full lines to the inoperative position indiconstructed inaccordance with this invention cated by dotted lines in this figure,there has been 10 may be used as a shield for the reflector of aprovided mechanism by means of which the two search light, or any arelamp having associated shield sections are suspended and movablymounttherewith a reflector which should be protected ed. Each of theshield sections is secured to a from damage by bits of hot carbon thrownoff bracket 5 having a vertically extending arm to carbon sticks of thelamp. I which the shield section is secured by screws or 15 Anotherobject of the invention is to so conbolts 5' and an upper arm 6. Thearms 6 of the struct and mount the shield that when it is in an twobrackets extend forwardly at an upward inoperative position in front ofthe reflector, it will cline from the vertically extending arms and haveentirely cover the reflector and thus prevent the their upper endportions 1 bent to extend horisurface of the reflector from becomingpitted or zontally and provide attaching portions which are 20 otherwisedamaged by small particles of carbon secured by screws or equivalentfasteners 8 thrown off during adjustment of the carbon. against theupper faces of the rearwardly ex- Anether bject of the invention is toS0 co tending arms 9 of bell crank levers I0. These bell struct themeans by which sections of the shield crank levers are formed withopenings H to reare mounted that they may be very easily and ceive thepivot pins or bolts l2 and extend through quickly swung from a positionin front of the rethe brackets l3 between upper and lower arms flectortoa position at opposite sides thereof where thereof. Rivets or equivalentfasteners l3 are they are disposed in advance of the reflectorv andprovided for securing the brackets l3 against the Willhe entirely out Ofthe yunder face of the bridge portion of a main brack- The invention isillustrated in the accompanyet or hanger It. This hanger is an elongated30 mg drawings, wherein bracket which extends transversely in thehousing Figure 1 iS View en ve y through t e of a moving pictureprojecting machine and has improved Shield and reflector, t e Vi w beingits arms I5 extending upwardlyin order that they along the line ofFigure may be secured in an overhead position within Figure V s a wShowing the e to parthe projector housing against side walls l6 thereof35 tially in rear elevation and partially in section. by screws orequivalent fasteners I1. Upper and Figure 3 is a view taken along theline 3-3 of lower spacers I8 and I9 are provided upon the Figure boltsI2 to maintain the bell-crank levers in prop- Figure 4 is a fragmentaryp pective view of er spaced relation to upper and lower arms'of the oneof the arms by means of which the shield secbrackets l3 whi h may breferred t a auxiliary 40 tions are movably mounted. brackets and thesebrackets are disposed diago- The p v d Shield constituting the j ctnallywith respect to the main bracket or hanger matter of this invention isemployed as means for M, as clearly shown in Figure 3 in order thatProtecting the polished Surface of a eflector l ample room will beprovided between these two of a moving p cture pr t n machine. Thebrackets to permit unobstructed movement by the 4D s d has companion t s2 formed f h atbell crank levers. The arms 20 of the bell crankresisting material These Companion Sections 2 levers are formed withlongitudinally extending are semi-circular in shape, as shown clearly inslots 2| through which extends a pivot pin or Figure and referring o tfigure it w be Seen bolt 22 carried by the fork 23 of an operating bar Fthat abutting edges of e twO S t O S are re- 'or handle 24. A spacer 25fits upon the bolt 22 CeSeed to form an Opening 3 through which thebetween the bell crank levers and, therefore, the carbon 4 extends whenthe two sections are swung bell crank levers may have free sliding andpivotto the operative position in front of the reflector. al movementrelative to the bolt 22 when the bar .Therefore, when the current isfirst turned on, or handle 24 is shifted longitudinally of itself. Asmall particles of cut carbon which are thrown knob 25 is provided atthe rear end of the bar in order that it may be easily grasped andshifted longitudinally and it will be understood that this bar is ofsufficient length to project rearwardly from the housing or casing ofthe motion picture projecting machine.

When this device is in use, it is mounted in the casing or housing ofthe moving picture projecting machine and the hanger It secured to anoverhead support which may be the side walls lb of the housing or anyother convenient overhead support in the housing of the'moving pictureprojecting machine. The hanger is so mounted in the housing of themoving picture projecting machine that when the sections 2 of the shieldare in the operative position shown in full lines in Figure 3, they willbe disposed immediately in front of the reflector l in close proximitythereto. The shield forming sectionsare of such dimensions that theshield is slightly larger than the diameter of the reflector and,therefore, when the shield is in the operative position, it will en'-tirely cover the reflector and eliminate all danger of cut particles ofcarbon thrown off by the carbon scratching the polished surface, of thereflector. When the arc hasreached such'an intensity that particles ofcarbon are no longer thrown off and it is burning with a steady flame,the knob 26 is grasped and the bar or handle 24 brought rearwardly. Thismovement of the handle causes the bell crank levers to turn about thepivot pins or bolts l2 and the bracket to which the shield sections aresecured will be swung forwardly towards sides of the housing of themoving picture projecting machine until they reach the positionindicated by dotted lines in Figure 3. In this position, the shieldsections will be disposed forwardly of the reflector and in such spacedrelation to each other transversely of the housing that they will be outof the way and not constitute an obstruction which would prevent lightfrom being properly projected forwardly by the reflector. When theshield is again needed, itis merely necessary to thrust the handle orbar forwardly to turn the bell crank levers about their pivots to theposition shown in full lines in Figure 3 and the shield sections will bereturned to the operative position in front of the reflector where theywill entirely cover the reflector and form a small opening through whichthe carbon 4 extends.

Having thus described the invention, claimed as new is:

1. A shield for are lamp reflectors comprising a mounting supported inadvance of a reflector, levers pivotally carried by said mounting forswinging movement in a horizontal plane, shield sections carried by saidlevers and movable therewith from an operative position in front of areflector about a carbon to an inoperative position in advance of thereflector at opposite sides of the reflector and the carbon, and meansfor simultaneously imparting movement to said 1evers and shifting theshield sections into and out of an operative position.

2. A shield for arc lamp reflectors comprising a hanger having means formounting the same in an elevated position in advance of a reflector andtransversely of the carbon, bearing brackets carried by and dependingfrom said hanger in spaced relation to each other laterally thereof atopposite sides of the carbon, shield sections adapted to fit about acarbon in front of a reflector and having meeting edges formed withregistering recesses providing a passage to accommodate the carbon,supports for said shi ld sections exwhat is tending forwardly from theupper ends thereof at opposite sides of the carbon and pivotally mountedin said bearing brackets and having lever arms extending toward eachother and overlapped, and an actuating element pivotally and slidablyconnected with the overlapped portions of the lever arms and movable toimpart pivotal movement to the lever arms and supports and shift theshield sections forwardly from an operative position in front of areflector to an inoperative position in advance of the reflector atopposite sides thereof. 7

3. A shield for are lamp reflectors comprising a hanger having means formounting the same horizontally in an elevated position in advance of areflector and transversely of a carbon, bearing brackets carried by saidhanger in spaced relation to each other, shield sections adapted to fitabout the carbon in edge to edge engagement with each other inv front ofa reflector, supports for the shield sections extending forwardlytherefrom and pivotally mounted in the bearing brackets and having armsextending towards each other transversely of the carbon between thebearing brackets and having overlapped portions formed withlongitudinally extending slots, and an actuating member having a portionengaged through the slots of said arms and shiftable longitudinally ofthe carbon to impart movement to the arms and supports and shift theshield sections from an operative position in front of a reflector to aninoperative position in advance of opposite sides thereof.

4. A shield for are lamp reflectors: comprising a hanger having meansfor mounting the same in an elevated position in front of a reflector,bearing brackets carried by said hanger in spaced relation to eachother, shield sections for fitting about a carbon in front of areflector, supports for the shield sections each having a verticallydisposed arm secured to a shield section and an arm projecting forwardlytherefrom, bell crank levers pivotally mounted in the bearing bracketsand having rearwardly extending arms secured to the forwardly extendingarms of the supports, the bell crank levers also having forwardlyextending arms slotted longitudinally and extending towards each otherand overlapped, an actuating member shiftable longitudinally, and forksat one end of the actuating member carrying a pin extending through theslots of the bell crank levers whereby shiftingof the actuating memberlongitudinally in one direction will impart pivotal movement to the bellcrank levers and swing the supports in a direction to move the shieldsections from an operative position in front of a reflector to aninoperative position in advance of the reflector at opposite sidesthereof.

5. A shield for are lamp reflectors comprising a hanger having means formounting the same in an elevated position in front of a reflector,bearing members carried by said hanger in spaced relation to each other,shield sections for fitting about a carbon in front of a reflector,supports for the shield sections each having an arm projecting forwardlyfrom a shield section, bell crank levers pivoted to the bearing membersand having rearwardly extending arms secured to the forwardly extendingarms of the supports and forwardly extending arms slotted longitudinallyand extending towards each other and overlapped, an actuating membershiftable longitudinally, and a pin carried by said actuating member andextending through the slots of the bell crank levers whereby shifting ofthe actuating member longitudinally in one direction will impart pivotalmovement to the bell crank levers and swing the supports in a directionto move the shield sections from an operative position in front of a.reflector toan inoperative position.

6. A shield for an arc lamp reflector comprising a support, coactingshield sections adapted to fit about a carbon in front of a reflectorand constituting a guard between the reflector and the are producing endof the carbon, arms for said shield sections extending therefrom andpivotally connected with said support and provided with extensionsprojecting towards each other, and an actuating member having a portionpivotally and slidably connected with the extensions of the arms andbeing shiftable longitudinally of the carbon between the arms to impartpivotal movements to the arms and shift the shield sections laterally ofthe carbon from an operative position in front of the reflector to aninoperative position in advance of the reflector.

MAURICE P. PARKER.

